4th order for Type R 12 d2

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Jroo
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CarAudio.com Elite
I have a type r 12 sitting around that I received cheap. I was told these are 4th order friendly and had kicked around the idea of building one since I am sitting on the sub. I saw plans recently for a sealed side of 09 (cu. ft) and ported side of 1.0 (cu.ft.) with a 4 inch port tuned to 50hz. I was wondering what the general performance of that plan would be? The last 4th order I had was similar ported and sealed sections but the tuning was higher like 60hz. The plans were made with a 1 to 1 ratio and higher tuning to get bandwidth from 70 down to 30 if I remember correctly.

 
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Jroo

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